| On-line official business system is a work environment with network, publication, standardization. As a part of the governmental affair, Its safety problem becomes important day by day. Digital signature is a technology which promises the information integrity and confirm its dispatcher in the network. It is the foundation of information safe theories and technology, and it has great value both in the electronic commerce and electronic governmental affairs.The dissertation it studied take On-line official business system for study background, firstly, it discuss the requirement of safety of On-line official business system and lay out the basic services of safety protect, including the services of the identity, purview control, communicating secrecy, data integrality and nondeny, etc. secondly, it study the theories foundation of digital signature and carry out a technique on this foundation, native test and round number operation ,etc. with the method of contrast, it mainly research and analyze characteristics and application of each kind of cryptogram algorithm, including symmetry encrypt algorithm DES, public key algorithm RSA and picking out digital summary algorithm MD5 etc. It emphasized at carried out RSA in according to different cryptogram intension ,and master its characteristic and application situation.using VC++6.0,it conformed the big number type ,realized its basic operation and accomplished the test of prime number.As a result ,it can work out signature technique .Then further study of the application project in various area can be realized. With the choices of the safe capability, calculation quantity and handling speed, possibility…etc. Finally,it can choose a digital signature function and realize an application of digital signature technique in On-line official business work system . |
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